Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ensm.2020.04.020
Title: A robust anionic sulfonated ferrocene derivative for pH-neutral aqueous flow battery
Authors: Yu, J
Salla, M 
Zhang, H
Ji, Y
Zhang, F 
Zhou, M
Wang, Q 
Issue Date: 1-Aug-2020
Publisher: Elsevier BV
Citation: Yu, J, Salla, M, Zhang, H, Ji, Y, Zhang, F, Zhou, M, Wang, Q (2020-08-01). A robust anionic sulfonated ferrocene derivative for pH-neutral aqueous flow battery. Energy Storage Materials 29 : 216-222. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ensm.2020.04.020
Abstract: © 2020 Despite that aqueous organic redox flow batteries (AORFBs) have recently been extensively investigated for low-cost large-scale energy storage, the option for viable catholyte remains limited. This is further constrained by the incompatibility of those positively charged redox species with the cation-exchange membranes. Here, we report an anionic sulfonated ferrocene derivative (Fc-SO3Na) bearing negatively charged moiety to tackle the above issue. The molecule has a solubility of 2.5 ​M in water and reveals remarkable electrochemical reversibility and stability in pH-neutral solution. A flow battery with Fc-SO3Na cathodic redox species and zinc metal as anode demonstrated superb performance in conjunction with sulfonated poly (ether ether ketone)/titanium oxide composite membrane (SPEEK/TiO2) as separator. The cell exhibits a capacity retention of 99.9975% per cycle at low concentration and at high concentration it shows an energy density of 27.1 ​Wh L−1 which is fairly comparable to the VFBs (25–30 ​Wh L−1). The volumetric capacity of catholyte could be further promoted to 293.5 Ah L−1 via redox-targeting reaction when LiFePO4 is loaded into cathodic tank.
Source Title: Energy Storage Materials
URI: https://scholarbank.nus.edu.sg/handle/10635/169655
ISSN: 24058297
DOI: 10.1016/j.ensm.2020.04.020
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